<SEC-DOCUMENT>0001104659-14-088409-index.html : 20141223
<SEC-HEADER>0001104659-14-088409.hdr.sgml : 20141223
<ACCEPTANCE-DATETIME>20141223104211
ACCESSION NUMBER:		0001104659-14-088409
CONFORMED SUBMISSION TYPE:	497K
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20141223
DATE AS OF CHANGE:		20141223
EFFECTIVENESS DATE:		20141223

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MFS SERIES TRUST I
		CENTRAL INDEX KEY:			0000798244
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		497K
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	033-07638
		FILM NUMBER:		141305282

	BUSINESS ADDRESS:	
		STREET 1:		111 HUNTINGTON AVENUE
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199
		BUSINESS PHONE:		18006372929

	MAIL ADDRESS:	
		STREET 1:		111 HUNTINGTON AVENUE
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MFS SERIES TRUST I /MA/
		DATE OF NAME CHANGE:	19940427

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MFS LIFETIME MANAGED SECTORS FUND
		DATE OF NAME CHANGE:	19930408

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LIFETIME MANAGED SECTORS TRUST
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000798244
<SERIES-ID>S000042701
<SERIES-NAME>MFS Low Volatility Equity Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132013
<CLASS-CONTRACT-NAME>A
<CLASS-CONTRACT-TICKER-SYMBOL>MLVAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132014
<CLASS-CONTRACT-NAME>B
<CLASS-CONTRACT-TICKER-SYMBOL>MLVBX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132015
<CLASS-CONTRACT-NAME>C
<CLASS-CONTRACT-TICKER-SYMBOL>MLVGX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132016
<CLASS-CONTRACT-NAME>I
<CLASS-CONTRACT-TICKER-SYMBOL>MLVHX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132017
<CLASS-CONTRACT-NAME>R1
<CLASS-CONTRACT-TICKER-SYMBOL>MLVMX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132018
<CLASS-CONTRACT-NAME>R2
<CLASS-CONTRACT-TICKER-SYMBOL>MLVOX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132019
<CLASS-CONTRACT-NAME>R3
<CLASS-CONTRACT-TICKER-SYMBOL>MLVPX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132020
<CLASS-CONTRACT-NAME>R4
<CLASS-CONTRACT-TICKER-SYMBOL>MLVRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000132021
<CLASS-CONTRACT-NAME>R5
<CLASS-CONTRACT-TICKER-SYMBOL>MLVTX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497K
<SEQUENCE>1
<FILENAME>a14-25347_9497k.htm
<DESCRIPTION>497K
<TEXT>
Document 1 - file: a14-25347_9497k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g253479bii001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g253479bii001.gif

</DOCUMENT>
</SEC-DOCUMENT>